I found this and thought it may be something worth thinking about, maybe get together and make a joint order for those that'd be interested. They won't sell just one or two items to private buyers, but if it was, say 10 mannequins, a box of hangers, a couple of display racks and 5 rails or whatever as a class, then it might be a fairly reasonable/cost effective option. Obviously they won't be great for everyone, but there could be enough people to make it worthwhile. Hope it helps.
http://www.tothetrade.co.uk/mannequins_or_sale.htm